A(n) is an environmental variable that alters the effectiveness of a stimulus as a reinforcer or alters the current frequency of all behavior that has been reinforced by that stimulus.

b) the planets year length would be longer

hope this !

answer; first blank(1); 30% two(2); salmonella; i believe this is correct; //good luck;

if im not mistaken its a. collective emotional arousal

answer; decipher the motives for why people behave the way they do;